180 NATURAL SCIENCE [March 



Calyx 

 Corolla 

 Stamens 

 Carpels 



Total 



It will be seen that these figures show an average of rather more 

 than one hundred parts (organ.s) to each specimen. 



The time occupied in the actual dissection of the specimens was 

 in the aggregate nearly 56 hours, this giving each specimen, on an 

 average, about 3 3- minutes. 



The floral formula obtained from last year's work was — 



Calyx, 5 ; Corolla, 5 ; Stamens, 54 ; Carpels, 36. 



This year's results are — 



Calyx, 5 ; Corolla, 5 ; Stamens, 54 ; Carpels, 35 : 



and the mean of the two — that is to say, the floral formula obtained 

 by calculating the mean of 1000 specimens, is — 



Calyx, 5 ; Corolla, 5 ; Stamens, 54 ; Carpels, 35. 



The results are given exactly, in tabulated form, below. 



It will be seen that the corolla shows a marked tendency to increase 

 the number of its members, more so in the first series than in the 

 second. In fact, in view of the large fraction, the corolla might 

 almost be given as 6. Four specimens in the 1000 conform to the 

 formula given — two in the first series (1896) and two in the second 

 series (1897). 



Calyx, 



